Thanks Greg. I can always rent a FF when if I really feel the need for better ISO or dynamic range performance. The 7D Mark II may be coming soon, hopefully it won't disappoint. I rented the 6D last year for a Spartan Sprint (partially indoor); I liked the IQ and ISO performance was outstanding; however I felt a little limited with the one cross type point in a larger view frame. I also missed some of the reach I have with my T4i.

A 1.4TC sounds like a good plan for a 5D Mark III and a 70-200, good luck.